(Topic ID: 276540)

Solenoid and display troubles - TMNT Data East

By P1nhead

3 years ago



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  • 6 posts
  • 1 Pinsider participating
  • Latest reply 3 years ago by P1nhead
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#1 3 years ago

Just picked up a TMNT and found the solenoids for the slingshots, pop bumpers, manhole cover and pizza wheel motor do not operate. The display was nonfunctional on purchase as well and advertised as such.

This will be a rambling of thoughts and schematics as I try and trace down the problems. Any help from the community would be greatly appreciated.

Solenoids: I've checked the fuses at F4, F5, and F6 on the PPB. the clips are good. The switches work properly as I can hear and see the relay at K1 activate. the associated flashers in the backbox and playfield all work properly (CPU controlled auxiliary/special solenoids affected... Q8 to Q13, CPU control over the slingshots, pizza motor, and the three pop bumpers only).

Power supply fuses all check out as well, there was a new gulf pinball power supply installed. None of the transistors "look" bad for the CPU controlled auxillary solenoids (all the 'noids that are out except for the manhole cover that is ). No errors on startup with PIA.

So looking at the schematics the wires for the solenoid #16 (manhole cover) is CPU pin 9 part of CN12. CN12 also has wires for solenoids #9-15. Associated transistors Q23 (manhole cover) to Q30. I go find Q30 and the transistor is toast (pic attached). Think I have to replace the resistor too? I see TIP122 and the smaller 2N4401, not sure of the value of the resistor - know any good places to look up those color codes?

CN19 carry the wires from the auxillary solenoids to Q8-Q13. Again, these are the slingshots, pop bumpers, and pizza motor. CN3 is the 32v power for these. Maybe it is the relay board (at K1)? I can hear it click and watch the switch engage whenever depressing the skirt in the pop bumpers or switches on the slings. I haven't tested the 32v rail yet.

What is strange to me is the half populated PPB - comparing it to my TFTC, Q1 Q2 and Q3 (along with R19/D21, R18/D20, and R17/D19) are not populated on the TMNT PPB. The picture of the PPB in the TMNT manual shows these as populated but there is no reference in the schematics to them. Page 60 of the manual shows it being fully populated just like on my TFTC.

Display: 1.04 eeprom (game eeprom is 1.01) new LED display came installed but it was nonfunctional at purchase. Turns out a pin was broken off the EEPROM and the display ribbon cable was only attached to the top row of pins. Fixed the EEPROM and reseated it, adjusted the cable. Now the display has nothing but garbage on it at times, other times (seemingly random) it works perfectly. When in the diagnostics I am able to use the display for as long as I wish (when it works) but when in game the display will blank, then display donatello or whatever dot animation, then blank, then garbage, then normal.

My thought for the display is to just get a new EEPROM.

For the manhole solenoid I will replace the diode on the solenoid, TIP122, 2N4401, and whatever the resistor value is for that spot.

Not sure how to tackle the CPU controlled auxillary solenoids - the transistors and everything on that section of the MPU look perfectly fine.

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#2 3 years ago

I put in the band colors at digikey and came up with a 68ohm resistor, now that I looked harder in the manual I see it calls for 68ohm 1/2 watt.

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#3 3 years ago

Well this sucks. Stupid batteries... I am assuming that this is the source of my dmd issues and maybe the CPU controlled solenoids. I'll read up in the manual to confirm what those pins control.

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#4 3 years ago

Pulled the MPU, cleaned up the socket and pins on the CPU. Flipped the board over and saw that there had been prior (shoddy) work done.

The corrosion from the batteries wasn't horrible... I just wasn't able to remediate it all, so it will likely come back, correct?

I either need to resocket the CPU, new CPU, and replace some of the components that appear corroded or buy a new MPU.

The other board work appears to have been involving one of the transistors I didn't see anything wrong with on visual inspection (behind Q12) and the DM7408N chip in the photos. I wonder if this chip is responsible for the 6 solenoids that are all out?

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#5 3 years ago

For sure I am replacing all the diodes on those 6 solenoids... anyone of the opinion I should just replace EVERY diode on all solenoids, even if they are working? I'm leaning towards buying a new MPU than doing the through hole surface component work.

#6 3 years ago

Replaced all the diodes on my solenoids from the affected areas.

Replaced the MPU board with a new rottendog - love the NVRAM. New eeprom for the display.

All is functioning well! Will probably send out the old board for remediation. Anyone have recommendations?

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